**Question:** In herpes encephalitis, all of the following are true, except

A. Herpes simplex virus (HSV) commonly affects the brain.
B. The clinical presentation is similar to other viral encephalitides.
C. Treatment focuses on supportive care only.
D. Herpes simplex virus usually affects the cornea and mucous membranes.

**Core Concept:** Herpes encephalitis is a rare but severe form of viral encephalitis caused by the Herpes simplex virus (HSV), particularly HSV-1, but also HSV-2 in some cases. It involves the central nervous system and can lead to significant morbidity and mortality if not diagnosed and treated promptly.

**Why the Correct Answer is Right:**

Correct Answer: C. Treatment focuses on supportive care only.

In herpes encephalitis, the correct treatment involves antiviral medications like acyclovir, valacyclovir, or famciclovir, along with supportive care to manage the patient's symptoms and complications. The option "treatment focuses on supportive care only" is incorrect because antiviral medications are essential for reducing the severity and duration of the illness.

**Why Each Wrong Option is Incorrect:**

A. Herpes simplex virus (HSV) commonly affects the brain: Although HSV can infect the brain, this statement is partially correct. Herpes encephalitis is indeed caused by HSV, but it is crucial to administer antiviral medications and provide supportive care for optimal patient management.

B. The clinical presentation is similar to other viral encephalitides: While herpes encephalitis shares some symptoms with other viral encephalitides, distinguishing features may help in making the correct diagnosis, such as the characteristic "double-ring" enhancement on MRI scans and the presence of a vesicular rash elsewhere.

D. Herpes simplex virus usually affects the cornea and mucous membranes: Although HSV can initially infect the cornea and mucous membranes, herpes encephalitis primarily involves the brain, making this statement incorrect for the context of the question.

**Clinical Pearl:**

Herpes encephalitis is a severe illness that should prompt a high index of suspicion in patients with fever, altered mental status, and focal neurological deficits, especially if there is a history of preceding oral or genital herpes infection. MRI scans are often crucial in making the diagnosis due to the characteristic "double-ring" enhancement pattern, which helps differentiate herpes encephalitis from other causes of encephalitis. Early initiation of antiviral therapy significantly improves the prognosis.